body {
    /*background-color: #e9ecef;*/
    font-family: 'Poppins', sans-serif;
}
.header-section {
    background: linear-gradient(90deg, #2c3e50, #3498db);
    color: white;
    padding: 40px 0;
    text-align: center;
    border-radius: 0 0 20px 20px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}
.sidebar {
    position: sticky;
    top: 100px;
    z-index: 2;
    background-color: #ffffff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.sidebar .nav-link {
    color: #2c3e50;
    padding: 12px 15px;
    border-radius: 5px;
    transition: all 0.3s ease;
}
.sidebar .nav-link:hover, .sidebar .nav-link.active {
    background-color: #3498db;
    color: white;
    transform: translateX(5px);
}
.content-card {
    border: none;
    border-radius: 15px;
    background-color: #ffffff;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    margin-bottom: 30px;
}
.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}
.content-card .card-header {
    background-color: #2c3e50;
    color: white;
    border-radius: 15px 15px 0 0;
    padding: 15px 20px;
}
.table th {
    background-color: #f8f9fa;
    color: #2c3e50;
    font-weight: 600;
}
.table-hover tbody tr:hover {
    background-color: #e9ecef;
}
.img-gallery img {
    border-radius: 10px;
    transition: transform 0.3s ease;
}
.img-gallery img:hover {
    transform: scale(1.1);
}
.breadcrumb {
    background-color: transparent;
    padding: 15px 0;
}
hr {
    border-top: 2px dashed #3498db;
}
@media (max-width: 991px) {
    .sidebar {
        position: static;
        top: auto;
        margin-top: 20px;
    }
}